US3022449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current electromagnetic device
Assignee: Cutler Hammer Inc
•
Filing: 1956-12-21
•
Granted: 1962-02-20
•
Expires: 1976-12-21
Abstract
No abstract record available.
Inventors
- 👤 Hyink Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:27
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/10; H01H; H01H51/00; H01H51/30; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US744773A
Cited
GB573421A
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US2425179A
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US2585050A
Cited
US2713715A
Cited
US2754569A
Cited
US2801372A
Cited
US2878445A
Cited
US2802153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |